//
// detail/posix_fd_set_adapter.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#ifndef ASIO_DETAIL_POSIX_FD_SET_ADAPTER_HPP
#define ASIO_DETAIL_POSIX_FD_SET_ADAPTER_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include "asio/detail/config.hpp"

#if !defined(ASIO_WINDOWS) \
 && !defined(__CYGWIN__) \
 && !defined(ASIO_WINDOWS_RUNTIME)

#include <cstring>
#include "asio/detail/noncopyable.hpp"
#include "asio/detail/reactor_op_queue.hpp"
#include "asio/detail/socket_types.hpp"

#include "asio/detail/push_options.hpp"

namespace asio {
    namespace detail {

// Adapts the FD_SET type to meet the Descriptor_Set concept's requirements.
        class posix_fd_set_adapter : noncopyable {
        public:
            posix_fd_set_adapter()
                    : max_descriptor_(invalid_socket) {
                using namespace std; // Needed for memset on Solaris.
                FD_ZERO(&fd_set_);
            }

            void reset() {
                using namespace std; // Needed for memset on Solaris.
                FD_ZERO(&fd_set_);
            }

            bool set(socket_type descriptor) {
                if (descriptor < (socket_type) FD_SETSIZE) {
                    if (max_descriptor_ == invalid_socket || descriptor > max_descriptor_)
                        max_descriptor_ = descriptor;
                    FD_SET(descriptor, &fd_set_);
                    return true;
                }
                return false;
            }

            void set(reactor_op_queue <socket_type> &operations, op_queue <operation> &ops) {
                reactor_op_queue<socket_type>::iterator i = operations.begin();
                while (i != operations.end()) {
                    reactor_op_queue<socket_type>::iterator op_iter = i++;
                    if (!set(op_iter->first)) {
                        asio::error_code ec(error::fd_set_failure);
                        operations.cancel_operations(op_iter, ops, ec);
                    }
                }
            }

            bool is_set(socket_type descriptor) const {
                return FD_ISSET(descriptor, &fd_set_) != 0;
            }

            operator fd_set *() {
                return &fd_set_;
            }

            socket_type max_descriptor() const {
                return max_descriptor_;
            }

            void perform(reactor_op_queue <socket_type> &operations,
                         op_queue <operation> &ops) const {
                reactor_op_queue<socket_type>::iterator i = operations.begin();
                while (i != operations.end()) {
                    reactor_op_queue<socket_type>::iterator op_iter = i++;
                    if (is_set(op_iter->first))
                        operations.perform_operations(op_iter, ops);
                }
            }

        private:
            mutable fd_set fd_set_;
            socket_type max_descriptor_;
        };

    } // namespace detail
} // namespace asio

#include "asio/detail/pop_options.hpp"

#endif // !defined(ASIO_WINDOWS)
// && !defined(__CYGWIN__)
// && !defined(ASIO_WINDOWS_RUNTIME)

#endif // ASIO_DETAIL_POSIX_FD_SET_ADAPTER_HPP
